Over and Over SSAA with TBB - Jennifer Lucy Cook
Out Loud TTBB - Arr. Eric Knechtges
Our Song of Freedom (An Americana Medley) SATB - arr. Patti Drennan
Our Great Redeemer's Praise SATB - Arr. Anna Laura Page
Our Big Gay Holiday Tree TTBB - Kim Kuda
Otche Nash SATB - Nikolai Golovanov
Open the Eyes of My Heart SATB - Jack Schrader
Open Arms SATBB - Arr. Wilson Smith
Ong-Hye-Ya SATB - Hye-Young Cho
One Voice - Jerry Ray
One Step He Leads SATB - Pepper Choplin
One Short Day (parody) TTBB - arr. Steve Tramack
One Morning in May - Anonymous
One Day More - Arr. Anonymous
On the Sunny Side of the Street SATB - arr. Mac Huff
On the Railroad 2-Part - arr. Dave and Jean Perry
On the Mountain SAB - Arr. Donald Patriquin
On Silent Wings SSA - Audrey Snyder
On My Way SAB - Arr. Anita Cracauer
Olympic Hymn SATB - Leonard Bernstein
Old Time Rock & Roll 2-Part - Arr. Jeff Funk
Old Joe Clark SAB - arr. Judy Herrington and Sara Glick
Oklahoma TTBB - arr. William Stickles
Oklahoma Medley 2-Part - arr. John Leavitt
